Study summary · research use only
Acetyl-L-carnitine improves aged brain function
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
This rat study (male Fischer 344 rats) examined effects of acetyl-L-carnitine (ALCAR), given orally at 100 mg/kg bodyweight for 3 months, on memory, learning capacity, and brain synaptic function in aged animals, using the Hebb-Williams and AKON-1 tasks plus synaptosome assays from brain cortices. The abstract reports that choline uptake, acetylcholine synthesis, and depolarization-evoked acetylcholine release were all increased in the ALCAR group, along with increased depolarization-induced calcium ion influx into synaptosomes. Electrophysiological recordings in hippocampal slices showed increased excitatory postsynaptic potential slope and population spike size in ALCAR-treated rats. The authors concluded these findings indicate ALCAR increases synaptic neurotransmission and is associated with greater learning capacity in aging rats.
Abstract
The effects of acetyl-L-carnitine (ALCAR), an acetyl derivative of L-carnitine, on memory and learning capacity and on brain synaptic functions of aged rats were examined. Male Fischer 344 rats were given ALCAR (100 mg/kg bodyweight) per os for 3 months and were subjected to the Hebb-Williams tasks and AKON-1 task to assess their learning capacity. Cholinergic activities were determined with synaptosomes isolated from brain cortices of the rats. Choline parameters, the high-affinity choline uptake, acetylcholine (ACh) synthesis and depolarization-evoked ACh release were all enhanced in the ALCAR group. An increment of depolarization-induced calcium ion influx into synaptosomes was also evident in rats given ALCAR. Electrophysiological studies using hippocampus slices indicated that the excitatory postsynaptic potential slope and population spike size were both increased in ALCAR-treated rats. These results indicate that ALCAR increases synaptic neurotransmission in the brain and consequently improves learning capacity in aging rats.
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